Detection-signal



S. P. AND E. E. MARSH.

' DETEGTION SIGNAL. APPLICATION FILED FiB. I5. 19182 1,329,053, Patented Jan. 27,1920.

3 SHEETS-SHEET I.

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Ys. P. AND E. E. MARSH;

DETECTION SIGNAL.

if] n S. P. AND-E. E. MARSH.

DEECTION SIGNAL.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

SABGENT P. MARSH AND ELMER E. MARSH, OF CINCINNATI, OHIO.

DETECTION-SIGNAL.

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Specification of Letters Patent.

Patented Jan. 27, 1920.

Application filed February 15, 1918. Serial No. 217,357.

To all whom t may concern:

Be it known that we, SARGENT P. MARSH and ELMER E. MARSH, citizens of the United States, and residents of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Detection-Signals, of which vthe following is a specification.

Our invention relates to alarms, indicators or signals, and its object is to indicate surreptitious movement, and especially of automobiles. A further object of our invention is to indicate such movement whether the automobile be moved by the use of its own motive apparatus or be towed or otherwise moved on its driving wheels. It is also our object to provide this alarm, so that it can be readily set by theV rightful user of the vehicle so as to be in operative condition or out of operative condition, aecordingly as the vehicle is to be left alone or to be used by the rightful user. A still further object is to afford the alarm in a manner that will be certain to attract attention even in very noisy places as on the streets of large cities; and to eectively guard against derangement of the alarm apparatus or its operative mechanism. It is also our object in some examples to provide a device of this character which can be readily applied to a completed automobile by removing one of the parts thereof and substituting` our device therefor. Other objects will appear in the course of the description.

Our invention consists in the combination of parts and in the details of construction and arrangement of parts as will hereinafter be more fully described and claimed.

In the drawings:

Figure l is a sectional plan view of part of an automobile with our invention applied thereto, the section being on a horizontal plane corresponding to the line 1 1 of Figx;

Fig. 2 is a rear elevation of the apparatus as shown in Fig. l;

Fig. 3 is a partial plan view similar to Fig. l, but showing the extreme top of the casing, which is omitted in Fig. 1';

Fig. Aris a rear velevation similar to Fig. 2, but showing a modification;

I 'D1 5 's an upright transverse section on plane corresponding to the line 5 5 of ig. 2, and also approximately showing ythe modification of Fig. t on a plane corresponding to the line 5 5 of that figure;

Fig. 6 is a plan view similar to Fig. l, but showing another modification of' our invention as applied to a modified automobile part;

Fig. 7 is a partial vertical longitudinal section on a plane corresponding to the line 7 7 of Fig. 6; and

Fig. 8 is a lesser partial section like Fio. 7 showing another modification.

In carrying out our invention with the objects hereinbefore mentioned, the use of a sound-producing device is involved, and, as such device, we prefer toemploy a whistle of the kind used for signaling by policemen; since the sound made thereby is readily recognized by many people and by every police oiiicer.

Beca-use automobile thieves are not thwarted by rendering the motive apparatus of the automobile inoperative, but will hitch to it a horse or other automobile and tow it away, we provide operating means for the sound-producing device, be it such a whistle as just described, or other kind of device which will be actuated by some part intimately connected with the driving wheels of the vehicle. As here shown, the operative connection is made with the differential mechanism and the entire device is located within and protected by the casing of said mechanism.

As shown in Figs. l to 5, the rear or driving` axles l or" the automobile are differentially connected by suitable gears contained in the inner revolving casing 2, and which being well known, need not be shown or further described; it only being necessary for the purposes of our desription to mention that whenever either one of the driving wheels and its driving axle l is turned, rotation is imparted to this casing 2; and that at no time in the normal use of the automobile is either one of these axles l ever disconnected from this casing Fixed to and concentric with the casing 9. is the large bevel ring-gear 3 meshing with the'driving pinion t on the rear end of the driving or tail shaft 5 of the automobile, which, as is well understood, runs forward to the transmission me hanism through which iU is variously operatively connected with the motor of the vehicle. Generally when the automobile is stopped, this shaft 5 is disconnected from the motor ley-proper setting of the transmission mechanism; so that this shaft 5 is free to turn along with the axles 1 through the intermediary of the differential gears. Thus, hauling the automobile on its own wheels by extraneous motive power is very convenient and offers good opportunity to thieves to make away with the vehicle under the guise of repair men, even in crowded places in large cities.

As shown in Figs. 1 to 3, and as Fig. 5 also serves to illustrate the interior construction of, the differential casing, that incloses the iner shell or casing 2 and its associated gears 3 and 4 and forms bearings for the axles 1 and shaft 5, is in right and left parts 6 and 7 joined together in a vertical plane through the center line of the shaft 5 from front to rear, and having their opposite ends fixed to the hollow axles 8 around the axles 1 with the bearings 9 for these axles 1 and the bearings 10 for the differential shell or easing 2 and large gear 3 inside of these opposite ends. At the front these parts 6 and 7 support the bearing 11 for the driving or tail shaft 5.

As these casings are usually constructed, .and as is well known, any diametral cross vsection will appear substantially as seen in Fig. l, excepting the bearing 11 of the shaft 5 at the front. As shown in this example, however, the upper half of each part 6 and 7 of the diiferential casing is provided with an enlargement 12 or 13, respectively, extending in the form of a high substantially straight-topped ridge from front to rear across the respective part; so that when the parts are brought together a rather high and long box-like casing is formed, closed on all sides outwardly, but merging with the original walls of the parts 6 and 7 and openin-g vinto the interior of the di'erential casing formed by bringing these parts together.

Y The right hand part 6 next to the ringgear 3 has a downwardly projecting flange 14 extending along the junction of the enlargement 12 with the main wall of the part 6 fro-1n front to rear and recessed in its middle part to clear the gear 3. Fixed to this flange 14 is a frame 15 with rings 16 at its front and rear ends, and rings 17 nearer its middle and equally spaced forwardly and rearwardly from the vertical center line of the casing. Supported in these rings in horizontal alinement along the casing enlargement from front to rear are the cylinders '18. The middle rings 17 also have extending down from them and join ing themrtogether, a bracket 19 which has on the Vertical center line of the casing an upper bearing 20 and a lower bearing 21 with a large slot 22 between them, which is occupied by a bevel-gear having the upper and lower ends of its hub iournaled in the bearings 20y and 21, respectively. This bevel-gear 23 meshes with the large ringgear 3 of the differential mechanism.

A crank 24 has a short shaft 25 journaled partly in the upper bearing 20, and partly in the upper end of the hub of the Vgear 23 and held down by a flange 26 extending under a shoulder' in the upper part of said bearing 20 this crank having a wrist 27 extending upward. Plungers or pistons 28 it closely inside the cylinders 18 and a cross-head 29 has opposite ends connected to the pistons by short struts 30, while in its middle it has the transversely slotted yoke 31 with the wrist 27 bearing in the slot thereof. A suitable screw 32 and washer 33 hold the yoke and crank operatively together.

The; outer ends of the cylinders 18 have heads 34 each of which is provided with an inward check-valve 35 or 35 and an outward check-valve 36. Pipes 37 and 38 lead from the respective outward check-valves 36 and come together in a single pipe 39 leading into the whistle 40 which is mounted on the top 41 that joins the rings 17 of the frame 15 together above the cylinders 18 at the middle of the casing. Whistles which would be suitable for our purpose being of varied construction, and the one which we prefer being very well known, it is unnecessary to show the details of construction of the whistle; it being suflicient to understand that air in passing from the mouth-niece 42 out through the slots 43 near the middle of the body of the whistle produces the desired sound.

. rlhe lower end of the shaft 25 of the crank 24- is provided with downwardly extending clutch-teeth 44 inside the hub of the gear 23. The lower end 45 of the opening through the hub of the gear 23 is squared, and a slidable shaft 46 has a squared middle part litting inf the square part 45 of the hub, and has its upper end provided with clutch-teeth 47, which will mesh'with the teeth 44 and cause the crank shaft 25 to turn with the slidable shaft 46 if the slidable shaft is slid up in the hub. A setting lever 48 is fulcrumed on a pinI 49 in a lug 50 extending down from the front end of the bracket 19 with a short forward arm 5l compressing a strong helical spring 52 upvagainst a ledge 52 on the upper part of the rear end of said bracket 19; and with a long rear arm 53 which has, in suitable position, an opening down through it through which the slidable shaft 46 has a neck 54 extending with a head 55 thereon under thelower side of the lever-arm 53. Y

Mounted on the interior of the rear wall of the casing enlargement by means of a forwardly extending` bracket 56 on the wall, is a suitable lock 57 with a cylinder 58 extending rearwardly through a suitable open- Y ing in the casing wall, so that the exposed outer rear end of the cylinder 58 may receive the key 59. The bolt 60 of this lock is shot downward from the bottom of the lock inside the casing, and the rear end part of the rear lever-arm 53 bears against the lower' end of this bolt 60. Suitable locks for our purpose being of various construction, and the one which we prefer to use being of well known construction, it is unnecessary to show or describe the interior details thereof, it being sufiicient to understand that the bolt 60 may be shot down or up only by the use of the proper key 59 inserted into the cyll inder 5S.

The top of the casing enlargement preferably is provided with a suitable opening or openings to allow free passage of the sound waves from the whistle 40. Preferably, these passages are numerous and very small in diameter; as here shown, being the small holes 6l vertically through the casing top and having their outer ends covered by a fine mesh wire screen 62 to prevent the entrance of foreign matter to the casing and to prevent such matter clogging these openings.

As long as the bolt (30 is shot downward, the long rear arm 53 of the setting-lever 4-3 holds the slidable shaft 46 down, so that its teeth 47 do not mesh with the teeth da of the crank shaft 25. But if the bolt 60 shot upward by a proper application of the ke 59, the spring 52 acting on the front arm 51 of the setting lever throws the rear arm 53 upward and with it the slidable shaft 46, meshing its teeth 47 with the teeth 44 of the crank shaft 25. l/Vith the parts in these positions, as soon as the wheels of the automobile turn, with the large ring-gear 3 turning with them, the bevel-gear 23 of our device will be turned rapidly, and with it, through the clutching of the shafts Ll5 and 25, will turn theA crank 2%, which, by its engagement in the slotted yoke 3l con-V nected to the pistons or plungers 28, will reciprocate these pistons or plungers very rapidly in the cylinders 1S. These cylinders with their reciprocating pistons thus constitute a double acting pump, and the alternate discharges of air through the pipes 37 and 33 will amount to a continuous blast of air through the pipe 39 into the whistle 40, sounding the whistle very loudly and continuously as long as the wheels of the vehicle continue to turn, with the parts in the described p0 ition.

It is therefore unnecessa y for the rightful nearer of the ,ehicle having the keyV 59 to do any more tl shoot the bolt 50 downward when he is to leave the vehicle unattended; and any movement of the vehicle causing its rear wheels to turn will be indicated by a sound from the whistle ed). llllitli the gear 23 of our novice rather small relative to the ring-gear 23, the operation the double acting pump will be very rapidY even Iwith the very slow turning of the vehicle wheels; so that even a slight or slow movement of the vehicle will cause the alarm.

Such a loud and continuous blast of a whistle is certain to attract attention, not only of police oflicers, but of the public in general; so that it would be practically impossible for a thief or a surreptitious user of vehicle provided with our invention, properly set as above described, to travel very far with it without being apprehended. ln fact, in most municipalities, the blowing of a whistle on the public thorn oughfares is prohibited by law, except by police oliicers, so that such a sounding of the whistle in such communities would only mean to a police officer that his attention is to be given to the vehicle producing the sound. A rightful user forgetting to release the device from its sounding condition will be at once reminded of the condition; and if he does not release the device, he himself will be quickly stopped by a police officer and compelled to prove his rightful use of the vehicle by producing the key and properly setting the device for rightful use. lt will thus be seen that practically the only means of escaping with such a vehicle is to actually have the key to unlock or unset its alarm crevice. The security, of course, depends upon the reliability of the lock against picking or disruption; but, as is well known, locks of the kind herein indicated are very dependable as regards both of these methods. Or, a permutation lock may be used.

Furthermore, if the lock 57 be knocked entirely loose from its fastening, which in itself can be made very difficult by secure bolting of the lock to the casing side, the result is to leave the device in its set position. Even if it were not set when the lock is knocked loose, the removal of the lock with its downwardly extending bolt G() would permit the device to become set for sounding the alarm. It will thus be seen that having the downward position of the bolt to set the device for rightful use is better than a reverse relation, in which a displacement of the lock by punching through the casing opening might release the alarmsounding device.

Derangement of the whistle 4:0 is inzule diflicult by the smallness of the openings 6l. It will be understood that openings in the casing wall for the passage of the sound waves are not essential; since these will be very readily transmitted by the vibration of the casing walls. However, clogging of these openings by collection of foreign matter on the screen 62 will be quickly eliminated by the discharge of air from the whistle at any time it becomes necessary for the whistle to operate. intentional clogging of the openings by the wrongful user of the vehicle will somewhat reduce the intensity of the sound, but not sufficiently to avoid detection; and will be a reasonably sure indication of the guilt of the person as soon as he is detected. Any tampering with the mechanism by making openings in the casing, of course, requires a time and labor consuming operation impracticable to one stealing or wrongfully using an automobile. Such tampering is readily distinguished, by any onlooker, from repair operations, and would be almost sure to result in immediate detection of the person before he completed the operation.

In the modification shown in Fig. 4:, the left part 7 of the differential casing is as it is found on the automobile; and only the right hand part 6 is modified; it being provided with the entire enlargement l2 to contain the sound-producing device and its mechanism, which, with the exception of being inclined over toward the large ring-gea 3 and consequently provided with a much smaller gear 23', are approximately as just described, as is shown in full detail in Fig. 5, which serves to illustrate either the example of Figs. l to 3, or that of Fig. il. The advantage of this construction and arrangement will be appreciated when it is recognized that our invention may thus be applied to a vehicle already completed and in use, merely by removing the right hand part of the differential casing from the hollow axle 8 at that side and substituting our part 6 of the casing properly attached to the hollow axle 8 and containing the mechanism in vposition for properly meshing its gear 23 with the large ring-gear 3 of the differential mechanism.

In Figs. 6, 7 and 8 we illustrate another modification of the mounting and inclosure of our invention by which it is adapted to be readily applied to a differential mechanism having a casing of another typewhich does not separate on a vertical plane from front to rear, but is made up of a middle part unitary with the hollow axles, and front and rear parts separable from this middle part. Y

Thus, the hollow axles 63 surround the, vehicle axles 1 and are integrally joined at the middle by a large ring-shaped part 6l with large openings at its front and rear. Across its front is bolted the casingl part 65, and the driving shaft 5 is journaled in the bearing in said part 65; whilethe rear is ordinarily closed by a plain plate approximately conforming to the segment of a sphere; the completed casing being generally substantially spherical in its general formation, accommodating, inside, the revoluble differential shell 2 carrying the large ring-gear 3 in mesh with the driving-gear 4L' on the driving-shaft 5; and the axle 1 and the differential parts having their suitable bearings 67 inside the opposite casing ends.

For the application of our invention to a differential construction of this type, we substitute for the plain rear plate a rear plate 68 of substantially the same form peripherally and laterally; but having up and down medianly the ridge-like boxshaped elongated enlargement 69 substantially the same as the corresponding enlargement formed by the 'parts 12 and 13, or the unitary enlargement 12', in the preceding examples. This casing enlargement contains the sound-producinv r evice and its operating mechanism substantially of the same detailed construction as in the preceding examples with a few exceptions which will be described.

The mechanism is, of course, vertical instead of longitudinal, incident to its inclusion in the rear end of the casing rather than in the top, as in the preceding' examples; and, so as not to seal the lower pump inlet 35, a pipe 7 0 leads from it up well above the level of any substance that would be contained in the differential casing for lubricating the differential gears as well as the operative parts of our device. Moreover, if necessary to ob-viate splashing of oil out through the passages 61, they may be located up near the top of the casing in the rear side thereof, as the passages 61 in llig. 8; in which case it is preferable to move the whistle l0 up close to the top of the casing, connecting it to the pump cylinders by a shortened upper pipe 38 and a lengthened lower pipe 38; and the frame 15 being modified accordingly to support the whistle 40 in its elevated position. This elevation of the whistle also obviates any serious interference therewith by the lubricant contained in the differential casing. Also, with the whistle slots a3 above the lowermost passage 61 or 61, a rise of the oil in the casing above the level of these slots 43 is hinderedV since the oil would run out through the passage 61 or 6l before reaching this level.

Tn this type of casing, this rear plate is, of course, readily removable by mer-ly unbolting it; being provided in this way for convenient access to the differential gears which is not afforded by the type of casing treated in the precedin examples. Such convenient removal would, of course, be unfavorable tothe security of our device mounted in such a casing. To provide therefore1 for locking this removable rear section of the differential casing in place at the same time the device is set for producing the alarm.

As here show this locking is provided for by using a lock 7l which has its bolt 72 adapted to be shot out of its casing at one side or the other. This lock 71 is mounted at the top of the rear casing section in such an inclined position, on a suitable pedestal 7 3 integral with the casing section, that its bolt 72, it shot upward, engages behind the edge of the rear wall of the middle part 6l of the casing, in which edge is preferably a notch 6e receiving a lug 73 'oil the pedestal 7 3. The lower side of the rear casing section 68 has, on its` interior, a forwardly and downwardly projecting hooked lug 7e that engages with the edge of the wall of the middle part 6e at the bottom, preferably in a notch therein.

The notches 64s and 6e are readily filed in the part 6i, and prevent the rear section from being slid sidewise to derange the gearing, were the section unbolted, although not unlocked. Also, were the gear 23 not exactly concentric with the bolt-ilanges, it might be entirely unmeshed, under such a condition, by turningthe section around. The lugs in the notches prevent this. Moreover, as will be seen, any excessive turning of that kind will merely release the setting lever and render the alarm operative.

Then the lock-bolt 72 is retracted downwardly, the rear section 68 may be readily bolted in place upon or removed from the middle part 64; the gears 28 and 3 meshing and unmeshing readily.

The pedestal 73 has, continuous with it outside the top ot the casing section 68, a hump 7 5, and forwardly and downwardly through this hump 7 5 and pedestal 7 8 is the passage out through which extends the cylinder 76 of the lock 71 for access of the key 77. The lock is very securely bolted in place on the pedestal 73 and the passage thereto being verylong, forcible removal or" the lock. by punching it inward or the casing is very difficult.

Furthermore, this lock is made to also opcrate the setting-lever 48, which, in its connection with the slidable shaft e6 and therebelow, is the same as the setting-lever Li8 of the preceding examples and to the rear ot its connection. The longer arm 53 ot this setting-lever 48, however, is modified from the arm 58 in the preceding` example in that in its upward extension it inclines forwardly so that it has a downwardly rearwardly inclined surface 78 immediately behind and under the rear and lower end of the inclined lock 71. The rear end 7 9 ot the lock-bolt 7 2 which shoots down from the rear ot the lock 71 is beveled to cooperate with this inclined surface 78 so that, when the lock-bolt 7 2 is shot downward, it pulls the upper lever-arm 53 oi the setting-lever 48 forward, and with it the slidable shaft 46, disengaging its clutch-teeth 47 trom the clutchteeth le of the pump-operating cranhr shaft 25, as in the preceding example. When the bolt 72 is shot upward, it releases the v arm 53 to move forward: which the arm doesunder the action ot the spring 52, allowing the clutch-teeth 47 and 48 to mesh,

and connecting the pump for operation by the differential ring-gear 3 through the gear 1t will therefore be seen that setting the alarm device for operation also locks the entire casing part 68 against removal from the rehicle; yet this casing 1aart 68 is as readily removed as any other when the device is not set for alarm operation, because the uns-ettingsimultaneously unlocks the part 68 trom the other part of the casing, so that it may be readily removed by merely taking out the bolts by which it is connected to said other part.

1twill be noted that the long bore, through which the lock cylinder 76 extends, and the upper end ott the setting-lever arm 53 are so relatively positioned that it is practically impossible to manipulate the lever by any instrument inserted through the bore in case the lock and its cylinder should be knocked out of position., Such a relation of the lock to the setting-lever is therefore of value in connection with any type of casing, whether it be necessary to lock one section thereoi2 to the other or not.

,li-laying fully described our invention, what we claim as new and desire to secure by Letters Patent is:

l. 1n a detection signal, in combination with a structure and an element movably supporting said structure whereby said element moves when the structure is moved, a sound-producing device, mechanism to meyhanically operate said device, and an eX- chisively lock-controlled driving connection between said mechanism and said element.

2. 1n a detection signal, in combination with a struct-ure and an element movably supporting said structure whereby said element moves when the structure is moved, a sound-producing` device, mechanism to mechanically operate said device, an exclusively lock-controlled driving' connection between said mechanism and said element, a single casing inclosing said device, said mechanism and said driving connection, and controlling means accessible from outside said vcasing for effecting the lock-controlling operation.

,ln a ldetection signal, in combination with a structure and an element movably supporting said structure whereby said elet moves when he structure is moved. a sound-producino` d vice, and exclusively loch-controlled mechanism operatively connectiiej said element and said device tor oneratin ot said device by said elen'ient i ien said element moves under one condition permitted by the lock-control, or inonerativelv disconnected whereby said device is lett inoperative upon moifement et said element under another condition peritted bv said lock-control.

et. In a detection signal, in combination with a structure and an element movably supporting said structure whereby said element moves when the structure is moved, a bearing for said element, a sound-producing device, exclusively lock-controlled mechanism operatively connecting said element and said device for operation of said device by said element when said element moves `under one condition permitted by the lock-control, or inoperatively disconnected whereby said device is lett inoperative upon movement of said element under another condition permitted by said lock-control, and supporting means for said mechanism in fixed relation to said bearing.

5. In a detection signal, in combination with a vstructure and an element movably supporting said structure whereby said element moves when the structure is moved, a bearing tor said element, a sound producing device, mechanism to inechanically operate said device, an exclusively lock-controlled driving connection between said mechanism and said element, and supporting means for said driving connection in fixed relation to said bearing.

6. In a detection signal, a combination with a structure and an element movably ,supporting said structure whereby said element moves when the structure .is moved, a bearing for said element, a sound-producing device, mechanism to mechanically operate said device, an exclusively lock-controlled driving connection between said mechanism and said element, a single casing inclosing said device, said mechanism and said driving connection and in xed relation to said bearing, and controlling means accessible from outside said casing` tor et'- fectina` the lock-controlling operation.

7. In a detection signal, in combination with a structuie and an element movably supporting` said structure whereby said element moves when the structure is moved, a sound-producing device, mechanism in permanent operative connection with said device to mecliaiiic'allv operate said device, and

exclusively lock-controlled driving ccnnection between said mechanism and said element. A

8. ln a detection signal, in combination with a structure and an element movably supporting` said structure whereby said cl,.- ment moves when the structure is moved, a bearing for said element, a sound-producing` device, mechanism in permanent operative connection with said device to mechanically operate said device, an exclusively lock-controlled driving connection between said .mechanism and said element, and supporting means for said driving connection in ixed relation to sa'id bearing.

9. In a detection signal, in combination with a structure and an element movablyY Supporting said structure whereby said element moves When the structure is moved, a

with a structure and an element movably supporting said structure whereby said element moves when the structure is moved, a bearing` for said element, a sound-producing device, mechanism in permanent operative connection with said device to niechanically operate said device, and exclusively lock-controlleddriving connection bctween said mechanism and said element, a

single casing inclosing said device, said mechanism and said driving connection and in fixed relation to said bearing, and convtrolling` means accessible trom outside said casing ttor effecting the lock-controlling operation.

ll. ln a detection signal, in combination with a movable means, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating` means and said Amovable means, a single casing` inclosing said device, said operating means and said actuating connection, and controlling means accessible trom outside said casing for eiilecting the locli-controlling` operation, said cas- Y ing comprising separable sections, and said device, actuating connection and cont-rolling means all being mounted entirely on one ot said sections.

12. ln a detection signal, in combination with a movable means, a sound-producing f device, operating means to operate saiddevice, a lock-controlled actuating connection between said operating means and said movable means, aY single casing inclosing` said device, said operating` means and said actuating' connection, and controlling means accessible trom outside said casing tor eiiecting the lock-controlling operation, said casing comprising separable sections, and locking` means to lock said sections together, under the control ot said controlling means,

13. ln a detection signal, in combination with a movable means, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating means and said movable means, a single casing inclosingsaid device, said operating` means and said actuating connection, and controlling means accessible from outside said casing for ettecting the lock-controlling operation, said casing comprising separable sections, and

said device, actuating connection and conllO vvtrolling means all being mounted entirely on one or said sections, and locking means on said one of said sectionsto locl; said sections together, under the control ot' said controlling means.

1li. fn a detection signal, in combination with a movable means, a soundproducing device, operating means to operate said device, a lock-controlled actuating connection between said operating means and said movable means, a single casing inclosing said device, said operating means and said actuating connection, and controlling means accessible from outside said casing tor edecting the lock-controlling operation, said casing comprising separable sections, and said device, actuating connection and controlling means all being mounted entirely on one of said sections, engaging means near one side of one of said sections, engaging with the other section, and locking means near an opposite side ot said one ot said sections to loclr said sections together in conjunction with said engaging means, said locking means being under the control ot said controlling means.

l5. ln a detection signal, in combination with a movable means, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating means and said movable means, a single casinginclosing said device, said operating means and said actuating connection, and having an access opening, and lcontrolling means accessible through said access opening for etecting the lock-controlling operation, said opening interiorly of said casing being directed away from said actuating connection.

16. ln a detection signal, in combination with a movable means, a sound-producing device, operating means to operate said device, a lock-controlied actuating connection between said operating means and said movable means, a single casing inclosing said device, said operating means and said actuating connection, and controlling means accessible from outside said casing tor eiiecting the lock-controlling operation by projecting to disconnect said actuating connection, whereby bodily removal of said controlling means permits said connection to be connected.

i7. ln a detection signal, in combination with a movable means, a sound-producing device, oper-acting` means to oper "'e said device, a lock-controlled actuating connection between said operating means and said movable means, a single casing inclosing said device, said operating means and said actuating connection, and having an access opening, and controlling means accessible through said access` opening` for edecting the` lock-controlling operation, engaging means' near one side` off said oneof said sections, engaging with the other section, and locking means near an opposite side of said one of said sections to lock said sections together in conjunction with said engaging means, said locking means being under the ontrol of said controlling means, and said `pening interiorly oit said casing being difooted away from said actuating connection. 18. In a detection signal, in combination with movable means, a pneumaticallyoperating soundproducing device, and lock-controlled pneumatic-pressure-raising mechanism operatively connected to operate said device by movement of said movable means under one condition permitted by the lock-control and inoperatively disconnected under anotheil condition permitted y said lock-control whereby said device is lett inoperative upon movement of said movable means.

19. In a detection signal, in combination with a structure and an element movably supporting said structure whereby said element moves when the structure is moved, a pneumatically-operating sound-producing device, and loch-controlled pneumatic-pressure-raising mechanism operatively connected to operate said device by movement of said element under one condition permitted by the lock-control, and inoperatively disconnected under another condition permitted by said lock-control whereby said device is left inoperative upon movement of said element.

20. ln a detect-ion signal, in combination with movable means, a pneumaticallyoperating sound-producing device, and an exclusively loclccontrolled pneumatic-pressure-raising mechanism operatively connected to operate said device by movement of said movable means under one condition permitted by the lock-control and inoperativelv disconnected under another condition pe itted by said lock-control whereby said device is lett inoperative upon movement ot sa l movable means.

' l. in a detection signal, in combination i a structure and an element movably supporting said structure whereby said element moves when the structure is moved, a pneumatically-operating sound-producing device, and an exclusively lock-controlled pneumatic-pressureraising mechanism op eratively connected to operate said device by movement oic said eiement under one con dition permitted by the lock-control, and inoperatively disconnected under another condition permitted by said lock-'control whereby said device is lett inoperative upon movement of said element.

Q2. In a detection signal, in combination with movable means, a pneumatically-operating sound-producing device` and lock-'controlled pnenmatic-pressure-raising mechanism in permanent operative connection with said device to operate said device by movement of said movable means under one condition permitted by the lock-control and inoperatively disconnected under another condition permitted by said lock-control whereby said device is left inoperative upon movement of said movable means.

23. In a detection signal, in combination with movable means, a pneumatically-operating sound-producing device, pneumaticpressure-raising mechanism to operate said device, a lock-controlled driving connection between said mechanism and said movable means, a single casing inclosing said device, said mechanism and said driving connection, and controlling means accessible from outside said casing for effecting the lock-controlling operation.

24. In a detection signal, in combination with a structure and an element movably supporting` said structure, whereby said element moves when the structure is moved, a pneumatically-operating sound producing device, pneumatic-pressure-raising mechanism to operate said device, and a lock-controlled driving connection between said mechanism and said element, a single casing inclosing said device, said mechanism and saiddriving connection, and controlling means accessible from outside said casing for effecting the lock-controlling operation.

25. In a detection signal, in combination with a differential mechanism, its casing and a movable element thereof in said casing, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating means and said movable element, said device, operating means and connection all being inclosed in said casing, and controlling means accessible from outside said casing for effecting the lock-controlling operation, said casing comprising separable sections, and said device, actuating connections and controlling means all being conta-ined entirely in one of said sections.

26. In a detection signal, in combination with a differential mechanism, its casing and a movable element thereof in said casing, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating` means and said movable element, said device, operating means and connection all being inclosed in said casing, and controlling means accessible from outside said casing for effecting the lock-controlling operation by projecting to disconnect said actuating connection, whereby bodily removal of said controlling means permits said connection to be connected.

27. In a detection signal, in combination with a differential mechanism, its casing and a gear thereof in said casing, ia soundproducing device, operating means to operate said device, a. gear meshing with said gear of the 'differential mechanism, and a rcleasable driving connection between this gear and said operating means, said device, operating means, gear and driving connection all being inclosed in said casing.

.'22, In detection signal, in combination with a differential mechanism, its casing and a movable element thereof in said casing, a pneumatically operating sound-producing device, pneumatic-pressure-raising mechanisin to operate said device, and a releasable driving connection between said mechanism and said element, said device, mechanism and connection all being inclosed in said casing.

29. In a detection signal, in combination with a differential mechanism, its casing and a gear thereof in said casing, a pneumatically-operating sound-producing device in said casing, an operating mechanism for said sound-producing device, in said casing, comprising a cylinder with an inlet, a valved pneumatic connection from said cylinder to said device, a plunger in said cylinder, a crank, operative connection between said crank and said plunger, a gear in said casing in mesh with said gear of said differential mechanism, and releasable opeztive connection between said gear and said crank.

30. In a detection signal, in combination with a differential mechanism, its casing and a gear thereof in said casing, a pneumatically-operating sound-producing device 'in said casing, an operating mechanism for said sound-producing device in said casing, comprising a cylinder with an inlet, a valved pneumatic connection from said cylinder to said device, a plunger in said cylinder, a crank, operative connection between said crank and said plunger, a gear in said casing in mesh with said gear of said differential mechanism, a slidable shaft turning with this gear, slidable toward and away from said crank, clutch connections on said crank and said slidable shaft, respectively, a setting lever engaging said slidable shaft, a spring engaging said lever to slide said shaft into clutching connection with said crank, and a lock in said casing comprising a bolt normally bearing on said lever and holding said shaft out of said connection, and means accessible from the outside of said casing for operating said lock to move said bolt ont of said normal position and permit said connection of said shaft and said crank. Y Y

31. In a detection signal, in combination with a differential mechanism, its casing and a .gear thereof in said casing, a pneumatically-operating sound-producing device in said casing, an operating mechanism lfor said sound-producing device, in said casing, comprising alined cylinders YS/ithV inlets,

valved pneumatic connections from said cylinders to said device, plungers in said cylinders, a yoke connecting said plungers and having a transverse slot, a crank having a Wrist in said slot, a gear in said casing in mesh With said gear of said differential mechanism, and releasable operative connection between said gear and said crank.

82. In a detection signal, in combination With a differential mechanism, its casing and a gear thereof in said casing, a pneumatically-operating sound-producing device in said casing, an operating mechanism for said sound-producing device, in said casing, comprising alined cylinders with inlets, Valved pneumatic connections from said cylinders to said device, plungers in said cylinders, a yoke connecting said plungers and having a transverse slot, a crank having a Wrist in said slot, a gear in said casing in mesh With said gear of said dierential mechanism, a slidable shaft turning With this ofear, tovvard and avvay from said crank, clutch connections on said crank and said slidable shaft, respectively, a setting lever engaging said slidable shaft, a spring engaging said lever to slide said shaft into clutching connection with said crank, and a lock in said casing comprising a bolt normally bearing on said lever and holding said shaft out of said connection and means accessible from the outside of said casing for operating said lock to move said bolt out of said normal position and permit said connection of said shaft and said crank.

33. In a detection signal, in combination With a movable means, a sound-producing device, operating means to operate said device, a lock-controlled actuating connection between said operating means and said movable means, a single casing inclosing said device, said operating means and said actuating connection, and controlling means accessible from outside said casing for eecting the lock-controlling operation, said casing comprising separable sections fastened together, means inside said sections whereby they are prevented from sliding relatively to each other when unfastened, and locking means to lock said sections together, under the control of said controlling means.

SARGENT P. MARSH. ELMER E. MARSH.

Witnesses:

JAMES N. RAMSEY, CLARENCE PERDEW. 

